347 stroker help

Ok, are you saying you want 550rwhp with or without the power adders? To get that kind of power N/A, you are really going to have to go for some much bigger heads. You need to start thinking about what kind of power adder you want before you start building the engine. If you want a boosted application, that is going to mean a different cam and lower compression. For a boosted application you are going to want something along the lines of a 42lb/hr injector. Nitrous you can go with a 30lb/hr. Nothing smaller than that though. I would strongly recommend stepping up to a 351 block, and doing a 408 stroker. I regret building a 347. You're always on the edge of what the block will take. If you want a 347 with 550rwhp, you are going to have to step up to a Dart block, or a Ford racing block to have any margin of strength. The cost of a racing block will easily make up the difference in price of going to a 351 factory style block. If you are looking for 550rwhp, I would skip the Twisted Wedge street heads, and go to either a Trick Flow Hi-port, or R series Twisted Wedge. You're going to need to spray about 200 on top of that.

Kurt